Global ETD Search

171	The feasibility and development of a system for analysis of multispectral computed tomography Persoff, Jeffrey J. January 1981 (has links) No description available. Tomography -- Data processing.
172	The effects of aberrations in synthetic aperture systems Hooker, Ross Brian, 1942- January 1974 (has links) No description available. Aberration. Imaging systems -- Image quality. Optical instruments.
173	Image quality criteria in the presence of moderately large aberrations Kessler, David January 1981 (has links) No description available. Imaging systems -- Evaluation. Optical transfer function. Aberration.
174	Application of coherence theory to enhanced backscatter and superresovling optical imaging systems Welch, Gisele Sawaya 12 1900 (has links) No description available. Coherence (Optics) Backscattering Mathematical models Imaging systems
175	Two-dimensional HMM classifier with density perturbation and data weighting techniques for pattern recognition problems Nilubol, Chanin 05 1900 (has links) No description available. Pattern recognition systems Markov processes Imaging systems
176	The directional filter bank : a multirate filter bank for the directional decomposition of images Bamberger, Roberto Hugo 12 1900 (has links) No description available. Image processing Electric filters, Digital Imaging systems
177	Stereo image compression Aydinoğlu, Behçet Halûk 08 1900 (has links) No description available. Image compression Data compression (Telecommunication) Imaging systems
178	Imaging of complete samples of Z tilde 1 3C sources / Imaging of complete samples of redshift of approximately one 3C sources Ridgway, Susan E January 1995 (has links) Scientific symbol in title. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. / Includes bibliographical references (leaves 118-124). / Microfiche. / xi, 124 leaves, bound ill. 29 cm Quasars Galaxies Red shift Imaging systems in astronomy
179	Simultaneous optimization of beam positions for treatment planning and for image reconstruction in radiotherapy Widita, Rena, Physics, Faculty of Science, UNSW January 2006 (has links) From one treatment to the next, considerable effort is made to accurately position radiotherapy patients according to their treatment plans. However, some variation is unavoidable. The target volume and the organs at risk may also move within the patient and/or change shape during the treatment. Thus, it is important to be able to verify the success of the treatment by determining the position of patient and the dose deposited in the patient at each fraction. One possibility to achieve this, particularly when equipment, time and budgets are limited, would be to collect limited information while the patient is on the treatment couch. This research was aimed to develop a method for optimum beam position determination, for each patient-specific case. The optimized beam positions would balance the both treatment planning and image reconstruction, so that the patient???s image can be obtained during the treatment delivery using the information collected from the same angles as used for treatment. This will allow verification of the dose deposited in the patient for every fraction. Using a limited number of angles for image reconstruction, the dose to the patient can be minimized. This work has two major parts, beam position optimization for image reconstruction and beam position optimization for treatment planning. These two optimizations are then combined to obtain the optimum beam position for both image reconstruction and treatment planning. An objective function, projection correlation, was developed to investigate the image reconstruction method using limited information. Another objective function, the average optimization quality factor, was also introduced to optimize beam positions for treatment planning. Two optimization methods, the gradient descent method and the simulated annealing based on these objective functions were used to determine the beam angles. The results show that the projection correlation presents several advantages. It can be applied without any iterations, and it produces a fast algorithm. The present research will allow selection of the optimum beam positions without excessive computational cost for treatment planning and imaging. By combining the projection correlation and the average optimization quality factor together with more advanced image reconstruction software this could potentially be used in a clinical environment. Beam optics Imaging systems in medicine Radiotherapy
180	Improvement of retrieved reflectance in the presence of clouds / Bartlett, Brent. January 2007 (has links) Thesis (Ph.D.)--Rochester Institute of Technology, 2007. / Typescript. Includes bibliographical references (leaves 173-175).

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